Storage cell

Abstract

A storage cell includes a positive electrode that includes a positive electrode current collector and a positive electrode active material layer which is formed on a surface of the positive electrode current collector and contains activated carbon, a negative electrode that includes a negative electrode current collector and a negative electrode active material layer which is formed on a surface of the negative electrode current collector and contains lithium titanate, and a separator that is disposed between the positive electrode active material layer and the negative electrode active material layer and is impregnated with an electrolytic solution which has lithium ion conductivity, in which a charge and discharge capacity through lithium ion occlusion is 16 mAh to 152 mAh per gram of the lithium titanate.

What is claimed is: 
     
         1 . A storage cell comprising:
 a positive electrode that includes a positive electrode current collector and a positive electrode active material layer which is formed on a surface of the positive electrode current collector and contains activated carbon;   a negative electrode that includes a negative electrode current collector and a negative electrode active material layer which is formed on a surface of the negative electrode current collector and contains lithium titanate; and   a separator that is disposed between the positive electrode active material layer and the negative electrode active material layer and is impregnated with an electrolytic solution which has lithium ion conductivity,   wherein a charge and discharge capacity through lithium ion occlusion is 16 mAh to 152 mAh per gram of the lithium titanate .   
     
     
         2 . The storage cell according to  claim 1 ,
 wherein amass ratio between the activated carbon and the lithium titanate is 1.5:1 to 7.5:1.   
     
     
         3 . The storage cell according to  claim 1 , wherein a content of the lithium titanate of the negative electrode active material layer is at least 80 percentage by mass. 
     
     
         4 . The storage cell according to  claim 1 ,
 wherein the electrolytic solution includes an organic solvent selected from a group consisting of propylene carbonate, ethyl carbonate, diethyl carbonate, and dimethyl carbonate.